Band-knife.



J;M. WHITGOMB.

BAND KNIFE. -APPLICATION FILED JAN. 8, 1914.

1,107,004. Patented Aug. 11, 1914 gnoewboa JOHN M. WHITCOMB, OF REDWOODFALLS, MINNESOTA.

BAND-KNIFE.

Specification of Letters Patent.

PatentedAug. 11, 1914..

Application filed January 8, 1914. Serial No. 811,055.

To all whom it may concern:

Be it known that I, JOHN M. WHITOOMB, a citizen of the United States,residing at Redwood Falls, in the county of Redwood and State ofMinnesota, have invented certain new and useful Improvements in Band-Knives; and I do declare the following to be a full, clear, and exactdescription of the mvention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in band knives to be used inconnection with automatic feeders for threshing machines.

The primary object of the invention is to so construct a knife of thischaracter as to render back lashing practically impossible.

A secondary object is to provide a knife of this character having meansfor stretching the cord around the bundle of grain and therebyfacilitating the cutting thereof.

With the above and other objects in view, the invention resides incertain novel features of construction and combination herein describedand claimed and shown in the drawings wherein Figure 1 is a verticalsection through a portion of an automatic feeder showing the applicationof my improved band knife; Fig. 2 is a perspective view of one form ofmy invention; and Fig. 3 is a similar view showing a slightly differentform.

In the embodiment illustrated, I have shown a portion of an automaticfeeder F having the usual conveying belt C for conveying the bundles Bbeneath the rotating shaft S on which my improved cutters are mounted inany suitable manner.

In Figs. 1 and 2 I have shown my invention as constructed of a fiatmetal plate 1 having a polygonal hole 2 at its center, its oppositeedges being out substantially on ogee curves as shown at 3, thus formingcam faces l on the forward edges of the plate. One end of each edge ofthe plate is curved in rather abruptly as shown at 5 for a purpose toappear and spaced at suitable distance from the curved portion 5 is acutting blade 6 whose active edge 7 is disposed at an angle to the edgeof the plate which it faces.

It is to be noted that the edges of the plate 1 are not sharpened, theactive edges 7 of the blades 6 performing the cutting actions while thecam faces t merely compress the cord 0 around the bundle B. This actionon the part of the cam faces 4:, will of course draw the cord very tightaround the bundle and when the cutter has revolved to such an extent asto allow the cord to spring past the curved portion 5, said cord willcome int-o forcible engagement with the cutting edge 7 of the blades 6.

It is a well known fact that when man forms of cutters are used inconnection wit 1 self feeders, the cutting edge of the cutter is proneto catch the cord 0 around the bundle B and thus tend to wind said cordaround the cutter supporting shaft S. This is due to the fact that themajority of cutters for the above purpose have a continuous cutting edgethroughout their length, and when said edge becomes dulled or nicked, itwill catch,

as above stated, on the cord and produce the undesirable effects beforestated. In order to overcome the difficulties heretofore experiencedwith knives of this character, I have devised the herein described bandknife which as shown, has a comparatively small cutting surface, themajority of its length being entirely smooth for the above mentionedpurposes.

Although I have described my invention with considerable minuteness, Ido not wish to be unduly limited to details. As illustrative of this, Ihave shown my improved band knife in Fig. 3 as provided with two sets ofcutting blades at each of its ends, the obvious reason being to insurethe cutting of the band before the bundle enters the thresher, thesecond blade cutting the band should the first one fail to do so.

Having thus described my invention, what I claim as new and desire tosecure by Let: ters Patent is- 1. A device of the character describedcomprising a flat plate having its edges cut substantially on ogeecurves and integral cutting blades projecting from the opposite ends ofsaid plate and of less width than said ends, said curved edges formingoppositely disposed compressing cams and the cutting In testimonywhereof I have hereunto set edges of said blades facing said cams and myhand in presence of two subscribing wit- 10 being spaced therefrom.nesses.

2. A band cutter knife comprising a flat 5 plate having a dull curvedcam compressing JOHN VVHITCOMB' edge terminating at one end in a,cutting Witnesses: edge which is spaced from and disposedat ISABELLEHATCH, an angle to said compressing edge. A. D. MCRAE.

Copies of this patent may be obtained for fire cents each, by addressingthe Commissioner of Patents,

Washington, D. G."

